Valve-grinding tool



P. J. CHURNSIDE.

VALVE GRINDING TOOL.

APPLICATION FiLED JUNE 9, 1919.

1,371,967, mm Max. 15,1921.

INVENTOR. WM 4am ATTORNEY.

S'f'iS PAT. "FFHQE.

EHILLIP JOHN QI-IURNSIDE, OF HUDSON, PENNSYLVANIA.

VALVE-GRINDING TOOL.

Applicationfiled June 9, 1919. Serial No. 302,850.

My invention relates to means for grinding valves to their seats, and like mechanical operations, and comprises an instrument particularly intended for grinding in the puppet valves of gasoline engines and the like. In this operation, it is desirable that the valve should be oscillated back and forth, 'ith, occasionally, an advance of the valve as will change the locus of the range of oscillation of the valve. My invention consists in novel and simple means whereby, by the continuous forward rotation of a crank, such oscillatory motion may be given to a valve and whereby, by proper and simple manipulation of such crank, the desired shifting of locus of the oscillation may be effected.

The objects of my invention are, to provide an improved, simple and effective valve grinding tool, adapted for giving the desired oscillatory motion to a valve, and to provide simply and effectively for the shifting of the locus of oscillation.

I will now proceed to describe my invention with reference to the accompanying drawings, in which one form of tool embodying my invention is illustrated, and will then point out the novel features in claims. In the 'said drawings:

Figure 1 shows a side elevation of the improved valve grinding tool; Fig. 2 shows a front elevation thereof, and Fig. 3 a transverse section thereof.

In the drawings, 1 designates a frame, provided with hearings in which a shaft 2 is rotatably mounted, and with another hearing in which a driving shaft 3 is mounted at right angles to shaft 2. Upon shaft 3 there is a crank arm 4; provided with a handle 5 by means of which shaft 3 may be rotated. At its upper end, shaft 2 is provided with a swiveled head 6 by which the tool may be steadied and, if desired, slight pressure applied, while it is in use.

On shaft 2 there are two rows of gear teeth. 7 and 8, one above and the other below the shaft 3, and on shaft 3 there is a row of Specification of Letters Patent. Patnfied Flay", 15, 1921.

gear teeth 9, the arrangement being such? that, during continuous rotation of the crank, 5, alternately one of teeth 9 Willengage one of teeth 7, and then'o'ne of teeth 9 will engage one of teeth 8, so imparting to shaft 2 an oscillatory motion the locus of which remains fixed.

In the particularconstruction shown, these gear teeth are all projecting pins; but thisapparently crude form of gear tooth, providing, as it does, conslderable back-lash, has for that very reason a distinct advantage, as Wlll be pointed out hereafter. In the particular construction shown, the tool is proportloned for desired angle of oscillation, by providing four teeth in each of rows 7 and .8,and three. teeth in row 9; rows 7 and 8' being staggered f relatively; but this relat1on maybe varied;

the important thing being-that by the rotation of crank 5 a tooth9 is caused to en-' gage and move a tooth 7, and then, after engagement between such'teethhas ceased,

a tooth 9 is caused to engage and move a.

tooth 8, so imparting an oscillatory motion to shaft 2. 1

When it is, desired to change the locus of the oscillation thus produced, the crank arm 5 is rotated backward for a turn or two.-

Owing to the backlash existing between the rows of gear teeth 7 and 8, on the one hand, and 9, on the other hand, the effect of this backward rotation is to cause teeth 9 to slip past the two teeth of series? and 8 which previously they have been engaging alternately, and to engage instead other teeth of those two rows; in other words, by this slips ping of the gear teeth, the shaft 2 is shifted beyond the range of the previous oscillation, so chang ng, as desired, the locus of the oscillation. Such locus having been so changed by momentary backward rotation of the crank, the previous forward rotation is resumed; or, if desired, the backward rotation is continued, and after a time, when shifting of the locus occurs when direction of rotation is changed from either direction to the other.

Valves such as those with which my tool is intended to be used are customarily providecl either with a key slot or spanner holes for engagement of thevalve by a grinding tool. Shaft 2 is provided at its lower end with a reversible bit 10, adapted at one end for engagement with spanner holes, and at tllie other end for engagement with a key s ot.

What I claim is V 1. Means for converting continuous rotary motion into oscillatory motion, comprising two shafts, arranged at an angle one to the 7 other, and supporting bearings therefor, the

one shaft having two sets of gear teeth on opposite sides respectively of the other said shaft, such other shaft having means adapt ed to engage and oscillate said two sets of gear teeth alternately, there being backlash between said two sets of gear teeth, on the one hand, and the engaging means therefor on the continuously rotating shaft, such that reversal of direction of rotation of the continuously rotating shaft causes the engaging means thereon to slip past the gear teeth with which it was previously engaged into enga ement with other gear teeth.

2. cans for converting continuous rotary motion into oscillatory motion, comprising two shafts, arranged at an angle one to the other, and supporting bearings therefor, driving means on one said shaft, which shaft is arranged to be rotated continuously in one direction with reversal of direction will, and driven means on the other said shaft and arranged on opposite sides of said continuously rotating shaft and to be endriven shaft, bearings therefor, and means for transmittingmotion from one to the other comprising means for transforming continuous rotary motion of the driving shaft into oscillatory motion of the other and for shifting the locus of oscillation upon reversal of direction of motion of the drivmg shaft.

l. An instrument such as described, C0111- 'prising in combination a driving shaft, a

driven shaft, bearings therefor, two rows of projecting pins on the driven shaft located respectively on opposite sides of the driving shaft, and pins on the driving shaft arranged to engage alternately pins of opposite rows of the driven shaft, there being backlash between the pins of the driving shaft, on the one hand, and the pins of the driven shaft, on the other hand, such that reversal ofdirection of rotationof the lriving shaft causes slipping of pins thereon from engagement with the previously-engaged pins of the driven shaft to engagement with other pins thereof.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

PHILLIP JOHN CHURNSIDE. Witnesses MARTIN BOHINSKI,

J. R. BARR. 

